We go to a tragedy at a popular resort in jackson hole, wyoming. Another avalanche this ski season. This one taking a snowboarder's life. Clayton sandell has the story. Reporter: For the first time in this ski season, an avalanche turns deadly. Snowboarder michael kazanjy at a mountain resort. Starts downhill and triggers an avalanche. Just a small blade of grass in a big moving, turning monster. Reporter: Fellow skiers, including a doctor, tried cpr to save him. Kazanjy was outside the resort boundary when he died, in the back country, where the thrills are bigger. But so is the risk. That kind of speed. That kind of power. You don't have much time. You have seconds to try to get out of the way. Reporter: Kazanjy was a lifelong skier, spending winters on the slopes. Mike lived life with a full heart. He loved his family. His cal bears. His skiing buddies and san francisco. On average, 28 people are killed in avalanches every year. And this is the second treacherous back country avalanche just this week. In colorado, davis la mayor watched his brother, edwin, get buried alive. Edwin could barely breathe, cemented in snow for ten minutes. Dig me out. Reporter: But the threat isn't just in the back country. An avalanche on one of theain ski runs at this utah resort monday, briefly trapped three people. A warning that this season on the slopes, the danger can be anywhere. For "good morning america," clayton sandell, abc news, denver.

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